NetWare Admin crashes

Every time that I try to use the NW Administrator on one computer it gives me an illegal operation. Below is a copy of some of the details of this error. Can anyone help me figure out how to fix this problem?

NWADMN32 caused an invalid page fault in
module MFC42.DLL at 015f:5f413cde.

I have copied the MFC42.DLL from a computer that was functioning properly and it worked once then it quick again.